Power-grinder.



C. E. SHIELDS. rowa'a GRINDER.

APPLICATION FILED FEB. 5. 1915.

.1 9 1 @Qfiqjfi Patented A r. 25, 1916.

2 SHEETS-SHEET I.

@0172? e s s es= C. E. SHIELDS.

POWER GRINDER.

APPLICATION FILED FEB. 5, 1915.

PsitentedApr. 1916.-

2 2SHEETS EE 2.

CARI E. SHIELDS, OF ROCK ISLAND, ILLINOIS.

POWER-GRINDER.

Specification of Letters Patent.

Patented Apr. 25, 1916.

Application filed February 5, 1915. Serial No. 6,233.

To all whom it may concern Be it known that I, CARL E. SHIELDS, a citizen of the United States of America, and resident of. Rock Island, Rock Island county, Illinois, have invented 'a certain new and useful Improvement in Power- Grinders, of which the following is a specification.

My invention relates to improvements in power grinders of the light portable geared type usually driven by foot or hand power, and in which the gear casing forms the principal base member and in which are formed the bearings for the gear shafts; and the objects of my improvement are first, to provide two-point bearings for the shafts and locate both bearings in theone casting or member; second, to provide a stand or supporting frame for the grinder that while made of common bar steel of light section is strong, durable and rigid; and third, to make possible the folding of the entire machine into a conveniently small package for shipment without dismantling other than the removal of a single brace.

These and other objects which may more fully hereinafter appear, I attain by the iechanism illustrated in the accompanying drawings in which,

Figure 1 is a perspective view of my improved grinder arranged as a foot power machine. Fig. 2 is a front elevation of my improved grinder arranged as a hand power machine with parts of the gear casing broken away. Fig. 3 is a perspective view of the hand power machine. Fig. 4 is a vertical sectional view taken on line 4-4 of Fig. 2.

Similar reference numerals indicate similar parts throughout the several views.

To the base member 1, which forms the lower portion of the gear casing, the forward legs 22 are pivotally connected by the bolt 3, and the rear legs H are pivotally connected to the same member by the bolt 5. The legs 22 are given considerable spread at their lower ends and are rigidly held in such relation by the brace bar 6, while the shaft 7 functions in the same manner in connection with the rear legs 4il. The pairs of legs are spread sufficiently forward and back, and rigidly held in such relation by the tie-bar 8 to afford a proper footing for the machine, guarding against top-heaviness, even with the weight of the operator thereon. It will be observed that by the removal of the tie-bar 8 the legs may be swung inwardly toward each other, effecting a compact package for shipment.

The upper portion 9 of the gear casing forming considerably more than one-half thereof, the division being made considerably below the diametrical center thereof, is securely bolted to the base member or lower portion by the bolts 10 and 11. To the side walls of the member 9 are integrally formed the bearings 13 and 14 for the shaft 15 to which is secured the gear 16. integrally formed from the walls of this same member and near the periphery thereof are the bearings 17 and 18 for the spindle 19 to which is secured the pinion 20, and on the outer end of which the cutting member or emery wheel 21 is carried.

From the above it will be seen that the gear shafts are supported at both ends by double bearings made integral in one cast ing, thus insuring perfect alinement of bearings and gears under all circumstances, a condition that cannot obtain where the bearings are in separate castings, or where the bearings are integral with the casing but support the shafts at one end only.

To the shaft 7 are pivotally connected the foot pedals 22-22, which are in turn connected, by the rods 23-23 to the crank arm 2 1. These cranks are secured to the ends of the shaft 15 on opposite sides of the gear case but in diametrically opposite position in the usual manner. While only one crank is shown it is to be understood that they are of like construction.

The adjustable seat 25 of ordinary bicycle type is secured to the legs 22 by the bracket 26. It is provided with the shank 27 and clamping bolt 28 through the medium of which, it is capable of vertical adjustment with respect to the bracket 26. An adjustable tool rest 29 of the usual form may be secured to the gear casing through the medium of the lug 30 and the bolt 31. When the grinder is to be driven by handpower, it is usually clamped to a bench or table for which purpose the arm 32 and winged clamping screw 38 are provided. The crank 34.- is then substituted for the foot pedals and connections.

Having thus fully described my invention, what I claim as new is 1. In a machine of the class described, the combination of a gear casing of circular form consisting of parallel walls spaced apart and joined at their peripheries, legs pivotally secured to the opposite edges of said casing, and shaft bearings made integral With and extending laterally from opposite Walls of said casing.

2. In a machine of the class described, a circular gear casing divided on a line parallel with and at a distance from the diametrical center, legs rigidly held in spaced relation and secured to the smaller portion of said casing, and shaft bearings formed integral With and extending laterally from the larger portion of said casing.

3. In a machine of the class described, a base member, pairs of legs rigidly held in spaced relation to each other and secured to said base member, a bearing member-provided With oppositely disposed integrally formed bearings secured to said base member, shafts supported by said bearings, and gears carried by said shafts between said bearings.

4:. In a machine of the class described, a base member, pairs of legs rigidly held in spaced relation to each other and secured to said base member forwardly and rearWardly thereof, a bearing member provided With oppositely disposed integrally formed bearings secured to said base member, a main shaft and a counter shaft supported by said bearings, gears carried by said shafts between said bearings, crank arms secured to the outer ends of said main shaft, a seat adjustably secured to said forward pair of legs, foot pedals pivotally secured to said rear pair of legs, and connections from said foot pedals to said crank arms.

5. In a machine of the class described, a hollow circular gear casing divided on a line parallel with and at a distance below the horizontal diametrical center, supporting means secured to the lower portion of said casing, shaft bearings formed integral with and extending laterally and Wholly from the upper portion of said casing, a drive shaft and a driven shaft mounted for rotation Within said bearings, an abrasive element supported by said driven shaft, and driving means secured to said drive shaft.

Signed by me at Rock Island, 111., this 3rd day of February, 1915.

CARL E. SHIELDS. Witnesses:

F. W. THIEsEN,

L. C. DOWNING.

Gopies of this patent may be obtained for fivecents each, by addressing the Commissioner of Patents. Washington, 10.0. 

